ER-model is a data model which lets describe the conceptual schemes in a specific subject area. It can help to highlight the key entities and specify relationships that can be established between these entities. During the database design, it is realized the transformation of ER model into certain database scheme based on the chosen data model (relational, object, network, etc.). There are used two notations for ERDs: Crow's Foot and Chen's.
Crow's Foot notation proposed by Gordon Everest represents the entity by rectangle containing its name (name must be unique within this model), and relation - by the line which links two entities involved in relationship. The relationship's plurality is graphically indicated by a "plug" on the end of the link, the optionality - by a circle. Entity-Relationship Diagrams based on Crow's Foot notation can be easily drawn using the ConceptDraw DIAGRAM. Extended with Entity-Relationship Diagram (ERD) solution, it is the best ERD diagrams software with powerful tools and ready design elements for Crow's Foot and Chen notations.
ConceptDraw Basic gives the opportunity of interaction with any ODBC-compatible databases. For this the Database Access Objects Model is provided. All calls to the database are made by certain methods of objects of this model.
How should diagramming software work? Is it possible to develop a diagram as quickly as the ideas come to you? The innovative ConceptDraw Smart Connectors Technology - This is more than enough versatility to draw any type of diagram with any degree of complexity.
Connection points are necessary for diagramming network, flowchart and organizational charts. In ConceptDraw you connect shapes by attaching, or snapping and gluing, connectors to shape connection points.
A pie chart is a circular diagram showing a set of data divided into proportional slices. There are several variations of this chart such as donut chart, exploded pie chart, multi-level pie charts. Although it is not very informative when a ring chart or circle chart has many sections, so choosing a low number of data points is quite important for a useful pie chart.
ConceptDraw DIAGRAM software with Pie Charts solution helps to create pie and donut charts for effective displaying proportions in statistics, business and mass media for composition comparison, i.e. for visualization of part percentage inside one total.
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